/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <string.h>

#include "ch.h"
#include "hal.h"
#include "test.h"
#include "chprintf.h"
#include "evtimer.h"
#include "buzzer.h"

#include "ff.h"

/*===========================================================================*/
/* Card insertion monitor.                                                   */
/*===========================================================================*/

#define POLLING_INTERVAL                10
#define POLLING_DELAY                   10

/**
 * @brief   Card monitor timer.
 */
static VirtualTimer tmr;

/**
 * @brief   Debounce counter.
 */
static unsigned cnt;

/**
 * @brief   Card event sources.
 */
static EventSource inserted_event, removed_event;

/**
 * @brief   Insertion monitor timer callback function.
 *
 * @param[in] p         pointer to the @p BaseBlockDevice object
 *
 * @notapi
 */
static void tmrfunc(void *p) {
  BaseBlockDevice *bbdp = p;

  /* The presence check is performed only while the driver is not in a
     transfer state because it is often performed by changing the mode of
     the pin connected to the CS/D3 contact of the card, this could disturb
     the transfer.*/
  blkstate_t state = blkGetDriverState(bbdp);
  chSysLockFromIsr();
  if ((state != BLK_READING) && (state != BLK_WRITING)) {
    /* Safe to perform the check.*/
    if (cnt > 0) {
      if (blkIsInserted(bbdp)) {
        if (--cnt == 0) {
          chEvtBroadcastI(&inserted_event);
        }
      }
      else
        cnt = POLLING_INTERVAL;
    }
    else {
      if (!blkIsInserted(bbdp)) {
        cnt = POLLING_INTERVAL;
        chEvtBroadcastI(&removed_event);
      }
    }
  }
  chVTSetI(&tmr, MS2ST(POLLING_DELAY), tmrfunc, bbdp);
  chSysUnlockFromIsr();
}

/**
 * @brief   Polling monitor start.
 *
 * @param[in] p         pointer to an object implementing @p BaseBlockDevice
 *
 * @notapi
 */
static void tmr_init(void *p) {

  chEvtInit(&inserted_event);
  chEvtInit(&removed_event);
  chSysLock();
  cnt = POLLING_INTERVAL;
  chVTSetI(&tmr, MS2ST(POLLING_DELAY), tmrfunc, p);
  chSysUnlock();
}

/*===========================================================================*/
/* FatFs related.                                                            */
/*===========================================================================*/

/**
 * @brief FS object.
 */
FATFS MMC_FS;

/**
 * MMC driver instance.
 */
MMCDriver MMCD1;

/* FS mounted and ready.*/
static bool_t fs_ready = FALSE;

/* Maximum speed SPI configuration (18MHz, CPHA=0, CPOL=0).*/
static SPIConfig hs_spicfg = {
  NULL,
  IOPORT1,
  PA_SSEL1,
  CR0_DSS8BIT | CR0_FRFSPI | CR0_CLOCKRATE(0),
  2
};

/* Low speed SPI configuration (281.250kHz, CPHA=0, CPOL=0).*/
static SPIConfig ls_spicfg = {
  NULL,
  IOPORT1,
  PA_SSEL1,
  CR0_DSS8BIT | CR0_FRFSPI | CR0_CLOCKRATE(0),
  254
};

/* MMC/SD over SPI driver configuration.*/
static MMCConfig mmccfg = {&SPID1, &ls_spicfg, &hs_spicfg};

/* Generic large buffer.*/
uint8_t fbuff[1024];

static FRESULT scan_files(BaseSequentialStream *chp, char *path) {
  FRESULT res;
  FILINFO fno;
  DIR dir;
  int i;
  char *fn;

  res = f_opendir(&dir, path);
  if (res == FR_OK) {
    i = strlen(path);
    for (;;) {
      res = f_readdir(&dir, &fno);
      if (res != FR_OK || fno.fname[0] == 0)
        break;
      if (fno.fname[0] == '.')
        continue;
      fn = fno.fname;
      if (fno.fattrib & AM_DIR) {
        path[i++] = '/';
        strcpy(&path[i], fn);
        res = scan_files(chp, path);
        if (res != FR_OK)
          break;
        path[i] = 0;
      }
      else {
        chprintf(chp, "%s/%s\r\n", path, fn);
      }
    }
  }
  return res;
}

/*===========================================================================*/
/* Main and generic code.                                                    */
/*===========================================================================*/

/*
 * Red LEDs blinker thread, times are in milliseconds.
 */
static WORKING_AREA(waThread1, 128);
static msg_t Thread1(void *arg) {

  (void)arg;
  chRegSetThreadName("blinker1");
  while (TRUE) {
    palClearPort(IOPORT1, PAL_PORT_BIT(PA_LED2));
    chThdSleepMilliseconds(200);
    palSetPort(IOPORT1, PAL_PORT_BIT(PA_LED1) | PAL_PORT_BIT(PA_LED2));
    chThdSleepMilliseconds(800);
    palClearPort(IOPORT1, PAL_PORT_BIT(PA_LED1));
    chThdSleepMilliseconds(200);
    palSetPort(IOPORT1, PAL_PORT_BIT(PA_LED1) | PAL_PORT_BIT(PA_LED2));
    chThdSleepMilliseconds(800);
  }
  return 0;
}

/*
 * Yellow LED blinker thread, times are in milliseconds.
 */
static WORKING_AREA(waThread2, 128);
static msg_t Thread2(void *arg) {

  (void)arg;
  chRegSetThreadName("blinker2");
  while (TRUE) {
    palClearPad(IOPORT1, PA_LEDUSB);
    chThdSleepMilliseconds(200);
    palSetPad(IOPORT1, PA_LEDUSB);
    chThdSleepMilliseconds(300);
  }
  return 0;
}

/*
 * Executed as event handler at 500mS intervals.
 */
static void TimerHandler(eventid_t id) {

  (void)id;
  if (!palReadPad(IOPORT1, PA_BUTTON1)) {
    if (fs_ready) {
      FRESULT err;
      uint32_t clusters;
      FATFS *fsp;

      err = f_getfree("/", &clusters, &fsp);
      if (err != FR_OK) {
        chprintf((BaseSequentialStream *)&SD1, "FS: f_getfree() failed\r\n");
        return;
      }
      chprintf((BaseSequentialStream *)&SD1,
               "FS: %lu free clusters, %lu sectors per cluster, %lu bytes free\r\n",
               clusters, (uint32_t)MMC_FS.csize,
               clusters * (uint32_t)MMC_FS.csize * (uint32_t)MMC_SECTOR_SIZE);
      fbuff[0] = 0;
      scan_files((BaseSequentialStream *)&SD1, (char *)fbuff);
    }
  }
  else if (!palReadPad(IOPORT1, PA_BUTTON2)) {
    static WORKING_AREA(waTestThread, 256);
    Thread *tp = chThdCreateStatic(waTestThread, sizeof(waTestThread),
                                   NORMALPRIO, TestThread, &SD1);
    chThdWait(tp);
    buzzPlay(500, MS2ST(100));
  }
}

/*
 * MMC card insertion event.
 */
static void InsertHandler(eventid_t id) {
  FRESULT err;

  (void)id;
  buzzPlayWait(1000, MS2ST(100));
  buzzPlayWait(2000, MS2ST(100));
  chprintf((BaseSequentialStream *)&SD1, "MMC: inserted\r\n");
  /*
   * On insertion MMC initialization and FS mount.
   */
  chprintf((BaseSequentialStream *)&SD1, "MMC: initialization ");
  if (mmcConnect(&MMCD1)) {
    chprintf((BaseSequentialStream *)&SD1, "failed\r\n");
    return;
  }
  chprintf((BaseSequentialStream *)&SD1, "ok\r\n");
  chprintf((BaseSequentialStream *)&SD1, "FS: mount ");
  err = f_mount(0, &MMC_FS);
  if (err != FR_OK) {
    chprintf((BaseSequentialStream *)&SD1, "failed\r\n");
    mmcDisconnect(&MMCD1);
    return;
  }
  fs_ready = TRUE;
  chprintf((BaseSequentialStream *)&SD1, "ok\r\n");
  buzzPlay(440, MS2ST(200));
}

/*
 * MMC card removal event.
 */
static void RemoveHandler(eventid_t id) {

  (void)id;
  chprintf((BaseSequentialStream *)&SD1, "MMC: removed\r\n");
  mmcDisconnect(&MMCD1);
  fs_ready = FALSE;
  buzzPlayWait(2000, MS2ST(100));
  buzzPlayWait(1000, MS2ST(100));
}

/*
 * Application entry point.
 */
int main(void) {
  static const evhandler_t evhndl[] = {
    TimerHandler,
    InsertHandler,
    RemoveHandler
  };
  static EvTimer evt;
  struct EventListener el0, el1, el2;

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Activates the serial driver 2 using the driver default configuration.
   */
  sdStart(&SD1, NULL);

  /*
   * Buzzer driver initialization.
   */
  buzzInit();

  /*
   * Initializes the MMC driver to work with SPI2.
   */
  mmcObjectInit(&MMCD1);
  mmcStart(&MMCD1, &mmccfg);

  /*
   * Activates the card insertion monitor.
   */
  tmr_init(&MMCD1);

  /*
   * Creates the blinker threads.
   */
  chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
  chThdCreateStatic(waThread2, sizeof(waThread2), NORMALPRIO, Thread2, NULL);

  /*
   * Normal main() thread activity, in this demo it does nothing except
   * sleeping in a loop and listen for events.
   */
  evtInit(&evt, MS2ST(500));            /* Initializes an event timer object.   */
  evtStart(&evt);                       /* Starts the event timer.              */
  chEvtRegister(&evt.et_es, &el0, 0);   /* Registers on the timer event source. */
  chEvtRegister(&inserted_event, &el1, 1);
  chEvtRegister(&removed_event, &el2, 2);
  while (TRUE)
    chEvtDispatch(evhndl, chEvtWaitOne(ALL_EVENTS));
  return 0;
}